Brake-shoe.



1. A. CONNELLY1 BRAKE SHOE.

APPLICATION FILED MAR. I8, 1915.

PzitentedSept. 7, 1915.

dame-us A Conne/{y Inventor (1M S as,

Witnesses Attorhgy JAMES A. CONNELLY, OF HAMILTON, OHIO.

BRAKE-SHOE.

Liliiiifid.

Specification of Letters Eatent. Patented. Sept. '3, 1313.

Application fi led March 16, 1915. Serial No. 15,188.

To all 10/1 am it may concern:

Be it known that I, James A. CONNELLY, a. citizen of the United States, residing in Hamilton, Butler county, Ohio, have invented certain new and useful Improvements in Brake-Shoes, of which the following is a specification.

This invention relates to improvements in brake-shoes for railway rolling stock and will be readily understood from the following description taken in connection with the accompanying drawing in which:

Figure l is a perspective view of a brakeshoe exemplifying my invention: Fig. 2 a side elevation thereof: Fig. 3 a face c evation thereof: Fig. 4 a perspective view of one of the removable inserts viewed from the front: and Fig. 5 a perspective view of one of these inserts viewed from the rear.

In the drawing: 1, indicates the body of the brake-shoe which, in its general aspect, is similar to the standard brake-shoes ordinarily employed in railroad Work, the face of this brake-shoe however, not forming the braking surface; 2, a vertical series of dovetailed recesses extending across the face of the brake-shoe, these dovetails being wider at one edge of the shoe than at'the other edge; 8, tapered and dovetail-shaped metallic blocks fitting. in the dovetail recesses of the shoe, the faces of these blocks presenting themselves some distance forward of the face of the general shoe and presenting, collectively. their outer surfaces on a curvaturn adapted to the trend of the carwliccl or, driving wheel; l, the active faces of the blocks: 6, the beveled upper and lower edges of the blocks, giving to them their dovetail form; (3, the larger ends of the blocks; 7, the smaller ends of the blocks; 8, a transverse recess in the rear face of each block, this recess forming an air passage extending across the shoe between the shoe and the rear of the block; 9, recesses in the upper and lower edges of the blocks, these recesses extending from the active faces of the blocks to the rear faces of the blocks; 10, recesses formed in the rear face of the blocks and forming passages extending from recesses 0 to recesses 8; 11, recesses in the active faces of the blocks extending from their tops to the bottoms and placing the two recesses 9 of each block in communication with each other; and 12, round corners formed on those rear portions of the blocks which engage the subject to wear, all of the wear coming upon the inserted blocks, and these blocks may be of a specially good wearing material. such,

for instance, as chilled iron or white cast iron or manganese steel casting. When the blocks have so worn away that there is danger of the face of the shoe proper becoming worn, then the blocks are to be removed and new blocks substituted. It is found that in some cases brake-shoes of ordinary type wear excessively at one end, thus necessitat ing the replacing of the entire shoe long before some portion of its body has received such degree of wearing away as it ought to have before the shoe is replaced. In the present case if one of the blocks should be r come excessively Worn, "that individiml block may be replaced without disturbing: the less worn blocks.

The blocks need not be driven tightly into their recesses in the shoe. but may be simply inserted by hand. and the shoe is to be so related to the wheel with which it is to cooperate that the larger ends of the bloclc: are to come at the flanged side of the tread of the wheel, thus preventing the accidental displacement of the blocks.

The reccssing of the blocks provides for the dissipation, by means of air currents, of a considerable portion of the heat developed by the braking action. The rounding of the corners 12 provides air passages at those corners and'permits of the blocks satisfactorily fitting: the dovetailed recesses in the shoe even if the roots of the dovetails are not quite shar v It is to iie particularly noted first, that the neighboring blocks are not in contact with each other and that they project from the shoe proper; second, that the surface of the shoe proper takes no part in the braking action; and third, that the separation of the blocks from each other taken in connection with their projection from the surface of theshoe proper provides ventilating grooves extending all the way across the shoe between the blocks and between the shoe other whereby passages extending entirely across the structure are formed between neighboring blocks and between the face of the shoe proper and the wheel when the structure is in braking relationship to a wheel, combined substantially as set forth.

2. A brake-shoe comprising, a shoe proper provided with a series of tapered and dovetailed recesses extending across its'face, and a tapered dovetailed block seated in each recess and projecting out from the face of the shoe proper, recesses being provided between the rear faces of the blocks and the shoe proper to provide ventilating air channels, combined substantially as set forth.

3. A brake-shoe comprising, a shoe proper provided with a series of tapered and dovetailed recesses extending across its face, and a tapered dovetailed block seated in each recess and projecting out from the face of the shoe proper, the rear face of each block being provided with a recess extending from end to end, combined substantially as set forth.

end to end, and also with recesses extending across its upper and lower edges and cominunicatin with the recess in the rear of the block, conibined substantially as set forth.

5. A brake-shoe comprising, a shoe proper provided with a series of tapered and dovetailed recesses extending across its face, and a tapered dovetailed block seated in each recess and projecting out from the face of the shoe proper, the rear face of each block being provided with a recess extending from end to end, and also with recesses extending across its upper and lower edges and commw nicatingwith the recess in the rear of the block, and with a recess formed in its active face and communicating with the recesses in the upper and lower edges of the block, combined substantially as set forth.

6. A brake-shoe comprising, a shoe proper provided with a series of tapered and dovetailed recesses extending across its face, and a tapered dovetailed block seated in each recess and projecting out from the face of the shoe proper, the corners of the dovetailed portion of the blocks where they engage the dovetailed recesses of the shoe I proper being rounded, combined substantially as set forth.

JAMES A. CONNELLY.

Witnesses:

GEO. JOHNSON, HARRY E.-WONNELL. 

